.u-shadow-1dp.u-shadow-2dp.u-shadow-3dp.u-shadow-4dp.u-shadow-1dp.u-shadow-2dp@hover.u-shadow-3dp@hover.u-shadow-4dp@hoverApply shadow to the elements.
.u-shadow-1dp.u-shadow-2dp.u-shadow-3dp.u-shadow-4dp.u-shadow-1dp.u-shadow-2dp@hover.u-shadow-3dp@hover.u-shadow-4dp@hover